You go to jDownloader’a, in the FileGrabber bookmark you click on Add URL and paste the address copied before in the following way:http://test.seedhost.eu/userame/downloads/ubuntu-12.04.3-server-i386.isoYou need to add the following data "username:password@" between http://... and hostname so that the link in jDownloader will look like this:http://username:password@test.seedhost.eu/userame/downloads/ubuntu-12.04.3-server-i386.isoWhere "username" and "password" it's your seedbox user and pass.

Step 6

In Filegrabber you click on Continue with all.

If everything was done properly, the files added before should start downloading automatically in the Download bookmark.